Alfa Romeo alfa 33 Workshop Manual page 141

Condition
Starter motor turns but starting
does not take place
(continued)
Starter motor turns normally
but makes excessive or un-
usual noise
Starter motor does not develop
max power
Excessive brush wear
Sparking at the commutator
May 1983
IGNITION, STARTING, CHARGING SYSTEM
Probable cause
Wrong assembly: pinion engages only
l
partially
Impurities in the coupling: Clutch
l
does not slide on rotor shaft
Pinion engages ring gear properly
l
but the engine does not start
Defective mechanical parts
l
. F o r e i g n b o d i e s h a v e g o t i n t o i t
Brush contact on commutator
l
good
Brushes do not slide freely in the
l
guides
Ovalized commutator
l
Mica projecting out of commutator
l
copper sections
Brushes press excessively on com-
l
mutator
Wrong brushes
l
Electrical overload in general
l
Slack brush springs
l
Mica projecting from copper
l
Corrective action
Check concentricity and pinion-ring
gear distance
Clean and lubricate. If necessary
clean the coupling completely
Pinion free wheel defective and must
be replaced. Faulty clutch to over-
haul or replace. Electra-magnet not
working properly: repair or replace
Check bearings. Examine bushes and
if necessary replace bearings
Clean them out
Replace brushes or snug them by
not
running the motor on no-load for
some time. Check brush spring
loading and replace them if they have
lost their elasticity
Clean the brush-holder guides or
replace the brush holders if neces-
sary
Turn within in prescribed limits, re-
move mica and clean commutator
Remove mica and clean commutator
Check brush spring loadings for
prescribed values
Replace with others of prescribed
Overhaul the engine
Replace brush springs
Remove mica and clean the com-
mutator
. .